He hasn't the heart to disperse a crowd (6)
I believe the answer is:
coward
'he hasn't the heart' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'disperse a crowd' is the wordplay.
'disperse' indicates an anagram (I've seen 'disperses' mean this).
'a'+'crowd'='acrowd'
'acrowd' anagrammed gives 'COWARD'.
'to' is the link.
Can you help me to learn more?
(Other definitions for coward that I've seen before include "Scaredy-cat" , "wimp" , "A craven person" , "Craven type" , "Chicken" .)